Revision 178733

o Added inherited field to the Plugin and Goal classes in maven.mdo
o Added annotation inheritedByDefault (looks like: @inheritedByDefault true|false) for java mojos
o Added support for inheritedByDefault to MojoDescriptor, descriptor generator and builder
o Factored the plugin combinatorial logic into ModelUtils in o.a.m.project, for later reuse in a plugin-aware model inheritance builder
o Refactored the DefaultModelDefaultsInjector to use the new ModelUtils for plugin merging (this is factored into a utility for reuse in inheritance assembly)